Electrical water-heater.



D. B. RAWSON. ELECTRICAL WATER HEATER. Arrmouxou FILED JULY a. 1901.

Paiinted May 18, 1909.

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Dama aliwsoN. or Los ANGELES, CALIFORNIA.

ELECTRICAL WATER-HEATER.

Specification of Letters Patent. Application med .fury s, 1907, serialNo. 332,574.

Patented May 1B, 1909. `l

To all 'whom 'it may concern:

Be it known that I, DELXA B. Rawson', a citizen of the United States,residinp1 at Los Angeles, in the county of Los Angeles n'nd 5 State of(laliornia,lw.ve invented new and lectrieal Weteruseful In] irovementsinl) Heaters, ol which the following is a specification. V

My invention relates to an improved l0 wire of high resistance, and itis the object of my invention. to provide a heater which `willwitl'lstand sharp changes of temperoture Without any injury thereto. l

. L'furtherbect-isto provide ahe'aler so constructed that it may heeasily dismounted and reassembled.

I accomplish' these oh jects hy ineans of the device'lesciibed hereinand illustrated in the accompanying drawings, in Whichz Figure -1,-is"aperspective View oi my complete heater as it appears installed inconnectlon with a waslfbowl. Fig. 2,-is an enlarged vertical section ofthe heater showingV the water passages therethrough. Fig. 5f-is avertical section taken at right angles to the section of Fig. 2.

Referring to the dra-#rings 5 designates a9 base preferably formed ofartificial stone and cast with dischargetube for the heater embeddedtherein. I have shown a heater ccmposedofV two units 7 and 8 whosedischarge 'pipes .J'and 10 are connected to the common discharge pipe 6at the top ol' the heater. Induction pipes 1 l and 12 of the twounitsconnect to a common supply pipe 13 controlled by valve 14 which isconnected to a source of water supply 15 shown in this )articularinstance as the cold water cock oi a Wnshhowl 16. "lhe`lower end ofdischarge .pipe 6 is turned ,outwardly and interiorly threaded for therece )tion of at dowmvardly curving spout 17 Whic 1 vprojects forwardlya sufficient dis- 45 tance to dlscharge the heated water from the unit-sinto the wash bowl. As bot-h of the units'are of identical constructionI will describe but one in particular. v

20 designates a core of insulating material, preferably unglazedporcelain, provided with spiral grooves 21 on its cylindrical face adapt ed to receive resistance wires 22 whose outer ends are connected 'tobindin' posts 23 located at the top of the core. zSplral grooves 56 21are two in number, the heating Wire starty ^ing'froxn the top of thecore in` one ofthe means for heating Water by means 'ofa eurrent ofelectricity passing through a eoil of 1 l the bottom of the core as isclearly shownin the lower part of Fig. 3. Binding `osts 23 areconnectedto a source oi' electrica su `ply by wires 24 through switch 25mountef on the upper end of base plate 5, the resistance s ir-es of thetwo units being' connected in parallel es is plainly shown in iin 1.Core 20 is provided with a flange 26 on its upper end cast integrallytherewith and adaptedv to receive theuppt r lie red end of a glasscasing, 27, the joint between the flande and the casing being made watertight by'rneas of o I rubber gasket 28. 'lhe body portion of cas"- Iing` 27 is just suiiiciently larve to fit over coro l 20 so that anyliquid which the casing' A largely conlined to a passage throu h spiralfrom-'es 2]. The lower end ofcorc is proivided with a detachahleflan e29`adfapted to fit against-the lower end oig glass cas iig' 27 and formo Water-tight 'oint thereviith'by means of gasket 30. Induction pipe 11fits into a ear it yin the lower end of'core 20 being secured therein bymeans of cement 31, a nut 32 and gasket washer 33 `on pipe 11 bearingagainst flange 2.!) and holding the same in en gagement with the loweiend ofcasing 27. A hole 34 is drilled in induction pipe 11 and acorresponding hole 35"in core 20 to provide for the outward passage 'ofWater from pipe `11 to the spaeebetweencore 20ed casing.,r 27. v'lheupper end of core 20 is also provided with a hore 36 in which dischargepi e 9 yis adapted to lee cemented with cement 7, the lower end of bore36'being connected to the space between core 20 4and casing 27h space todischar pipe 9.

In 'the eratigii of my heater water is lst adn tte to the units in theproper quantity 1an( the current is then turned on by means l of 'switch25. Resistance wires 21 immediately become heated 4and the Water passingthrough the grooves in Which-the resistance wires are Wound is alsoheated in its passage from the bottom to the top of the units'.

The temperature 4of the heated water may be regulated b`y adjusting thequantity of water supplied to the units by means `of valve .14, l f.

It willbe observed that I have utilized a core vwhich is cast in onesolid piece an-,l whichris less liable to breakage on that aecount thana core .whiclris cast hollow or which is iilled with a substance-.ofdifferent l grooves `and crossing to the other groove'at" passes throughfrom one end to the otherA 1s hole 3S so that the water may pass from tat i expansion ratio from the insulating material of the core. By usinga core. of one ieee l have produced a heater which will wit istand sharpchanges of temperature much more readily than one with any other kind ofa core and I have further provided' a heater which is simple inconstruction and readily dismounted and reassembled.

Having described my invention what l claim as new and desire to secureby Letters Patent iszl. In an electrical water heaterin eoinbi.- nation,a cylindrical insulating casing,.a cylindrical insulating core withinsaid casing, said core being rovided with spiral grooves on its surfacet 1ere being an'annular space4 around the core at each end thereofwithin the casing, an end flange, cast integrally with said core andadapted to close one end of said casing, a feed ipe secured4 in one endof said core, said fee ipe being in communication with said annularspace around the end of ,said core, an end flan e mounted around sai'dpipe, screw means to orce said flange against the end of said casin adischarge pipe secured in the other en of said core, said discharge pipebeing connected to the annular space around the end of said core, anelectrical heating element in the spiral grooves of said core, saidelement connecting to binding posts mounted on said integral end flange,

and a housing adapted to cover the upper4 end of said core and saidbinding posts.

2. In an electrical water heater, in combination, a plurality ofcylindrical insulating casin s, each of said casings haviner acylindrica insulating core therein, each of said cores being providedwith spiral grooves on its surface and there being an annular spacearound the core at each end thereoxe within the casing, an inte ral endlange at one end of said core and a apted to close one end of saideasing, said core being provided with a e from its surface beneath saidilange `out centrally through its end, a pipe gasketed in the outer endof said passage, means for insuring a water-tight joint between saidllange. and the end of the casing, a pipe entered eeiitl'ally into theother end of said core and fixed therein, the pipe and core-end bcingprovided with a passage establishing eon'nnunication between the pipeand the aforesaid annular space, a cover piece surrounding said pipe andadapted to close the end of the casing, a nut threaded on the pi e andadapted to-force said cover against t ie end ol tic casing, anelectrical heating element in the spiral grooves of said core, thc endsof said heating element being attached to binding posts fixed to saidflange, and a housing covering said flange and binding posts. v l

3.' In anelectrio water heater, in combination, a. base plate, aplurality of casings mounted on said plate, said casings being enlargcdat one ein spirally grooved cores 'litting within said casings, saidcores having at one end flanges which serve as caps for said enlargedends of said casings, theopposite ends of said cores being reduced indiameter to forni a space between the casing and core, said cores havingopenings located centrally of their ends, said openings leading intosaid spaces between the cores and casings, caps of non-conductingmaterial for closing one end of said casings, said caps having centralOpeliings therein, a connnon water suppl r pipe, pipes connecting saidcommon supp y with the openinvs in the lower ends of said cores, acommon discharge pipe embedded in said base plate, pipes connecting saidconnnon discharge with the openings in the upper ends of said' cores,and electrical conductors lying in the spiral grooves in said cores.

In witness that I claim the foregoing l have; hereunto subscribed mynaine this 28th day of June, A1907.

DlfllilA B. ltAWSQN.

Witnesses z TRIMBLE BARKELEW, EDMUND A. S'rniusn.

